Unfortunately, Kumamoto’s Kaketsuken has a long history of malfeasance. Here’s a quote from an older article:
“In the 1980s and ’90s, Kaketsuken was a defendant, along with the central government and several other drugmakers, in lawsuits filed by people who contracted the AIDS virus through contaminated blood products. It admitted responsibility, reached a settlement with the plaintiffs and apologised. "
Older article URL: http://www.asianews.network/content/japanese-drugmaker-blasted-40-year-cover-4799
Japan Times article URL: http://www.japantimes.co.jp/news/2016/04/08/business/corporate-business/kaketsuken-talks-sell-vaccine-business-astellas/